Vehicle brake mechanism



.45 mi?, tive y as known in the trade.l Thesebrake primary s Passed oa. eo, ms.

UNITED STATES PATENT orrica.t

Bo-s. salmoni), or soUrH BEND, IN'JIANA, AssIG'Non'ro ianivmxfmxn'conrm, or cmcaeo, rumors, A CORPORATION oF- ILLINoIsv v v'nmc'm'i 13ml.: meenemen'.

'Animation nieu February 28,1927. serialin. 171,503.'

My -inventionrelates to improvements in brake mechanism particularly'to'brake mechanism intended for usel in motor driven roady between two of theshoes. A further object is to provide improved positioningl means co- 10.operating Iwith the backing plate to auto? `matically assist inthe positioningof such oating pivotal connection and readily adjustable from' the opposite or outer side ofthe backing plate.

ment of easily adjustable positioning mecha'- nism associated with a floating pivotal con-- l neet-ion l.between two of the brake shoes mounted within the drum upon one side of '20 the backing plate, which mechanism isradaptf ed to automatically'position such floating Y connection with respect to the backing plate and to maintain the same at any point -to which'it may have been -moved during lts floating movement but which is yieldable to' permit'relocation of such ioatin'g connection j in (responseto 'the wiping action ofthe brake drum over the shoes. u Other advantages, obJects, and` worth I while features` of my invention will more I Tiully appear from theifollowing Vspecifica.-

Ation, appended claims and accompanying drawing, wherein:

J Fig. 1 is a vertical sectional view through brake -mechanism embodying my invention.

y Fig. 2 is a cross sectional view taken on ,ine2--2 of Fig. 1. Y i Fig. 3 is 'a cross sectional view taken on ,I have shown my invention embodied ina brake structure of a well known type where-- vin 10 indicates the rotatable brake drum; 12,

the stationary backing plate; and"14,1'6 and f .f 18 the articulated brake shoes being the pril' auxiliaryand secondary shoes respecshoes are 'pivot lly anchored tothe backing lplate at 20 T e auxiliaryand secondary shoes arel ,ivotally connected at 22' and the hoe is connected to the secondary shoe by a floatingl pivotal connection 24. The invention resides in this floating pivotal connection and means for mechanism. The shoes are actuated Iby a. cam

pivot piny is provided with a rad'a/l flange 341 Meritorious features reside in the employ# I tion 30 of the pivotpinand isheld under adjustable tension 'between' a,;nut,38- and a v lmerit of the brake shoes is' very vslight and` ositioning the same l. in combination with tje .remaining brake 26 anda spring 28 connects the primary'. and auxiliary shoes to drawfthem away fromthe brake drum... q

The pivotal connection 24 is provided-with a reducedaxial extension 30 which extends through the Vbacking plate through an opening 32, whichopening is sufficient-ly oversize the portion 30 of the pivot pin to permit." floating movement of such pin as accounted forbythe travelfof the brake shoes. The' 65 which frictionally engages the backing plate surrounding t-he opening 32. A spiralspring 36 encircles the outwardly? projectingporl washer 39 'to'inaintain the part 34 in frictional engagement with theba'cking plate' 12 so as to position'tlie pivotpin withrespet to the backing plate.' t

When th\e brakes are applied and actuated with respect to the drum, there is a limited Y liloating movement of the pin within the 1 opening '32. rIlhe action of the spring in maintaining the friptional engagement be-ft-Ween the part 34 @and the backing platel serves to hold'the pivotpin at the positionto which it is moved but the wiping action Iof the drum over the brake shoes serves to re;- turn the pivot pin to a normally central vposi- 'tion where it is held by the frictional engagement heretofore referred to.. It is to be re' membered that the clearance betweenthe brake shoes'and drum and the actual movethat infcoinmercial practicef'all--brake Vdrums are slightly out of round 'and due to this out of round`.condition a wipingaction-.of-the drum over the shoes' results .which produces effect hereinabove set forth.

. 'WhatI'claim is.: A' f j y 1. In brake mechanism, a drum, a backing plate provided with an opening, shoes mounted upon the plate within' the drum including l. a pair of shoes provided with a pivotal con-- backing plate,said connection being ofsuch size as to have apermitted floating 'movesment within said opening, and means engaging said connection on the opposite side of the backing' platetoreleasably hold the connection at any position to which it has been moved with respect to said platav v y 2; In brake mechanism, a drum', a backing' plate provided withan opening,shoes mount- 119 lnection extending through the opening in the ed.' upon the plate within the including .within said opening means engaging sa a' pair of shoes provided with a pivotal connection extending through the opening in the ,backing plate, vsaid connectien being of such size as to .have a permitted vfloating movement and adjustable spring connection on the opposite side of Jthe backing plate to releasably hold' the connection atv any position to which.

it as been moved with respect to said plate.

."In brake mechanism, a drum, .a backing l pla e provided with an opening, shoes mountbrake` shsa'ssociated wat :Said plate andy 25 ed pon the plate within the-drum including a p ir of shoes provided with a pivotal connec ion extending through the opening in the ba king plate, said connection lbeing of such s' e as to have a permitted loating movement ithin said opening and means holding said connection in frictional lengagement Wit-li the 20Y bacliing plate to releasably position the same at any point atwhich it mayl be moved withl respect to said plate.

4.'In brake mechanism, 'a backing plate,

provided with a iioating pivotal connection and positioning means adapted to automatically releasably hold said connection atjany position to'which it may have been moved with respect to s'aid backing plate'. f

A5. Inbrake mechanism, a backing plate,

brake shoes associated with said plate and.

Vment therein, positioning means engaging `said connection on the opposite side of the plate to restrain the, floating movement thereof. f

`7. In klbrake mechanism, backing plate provided with an openingV therethrough,V

brake shoes on one side of the plate provided with a pivotal connection extending through the opening in the plate for iloating`movement therein, positioning means engaging vsaid connection on the opposite side of the plate .adapted to releasably hold said connection at any position to which it mayv have been moved by such iioatingmovement.

v 8. In brake mecahnism,`a drum, a backing plate, shoes within the drum on one side of thebacking plate, said shoes provided with a oating pivotal connection Aextending through the backing plate, saidbacking plate provided with an opening about said connection of suiicient size to permit floating tioning means to maintain said connection in frictional engagement with the platevto hold the same at any position to which it may l have been moved during its iioating Inovement adapted to permit relocation thereof in responseI to the wiping of the drum over the shoes.

9. 4In brake mechanism, a drum, a backing plate, articulated brake shoes pivotally mounted upon the plate within the drum, two of said shoes provided with a oating pivotal connection, said connection extending through the backing plate, said backing plate provided with an opening .about said connecton` tion of suiiicient size to permit oating move- Y ment of the connection within the opening, positioning means maintaining said connection in fr ictional engagement with the hacking plate adapted to permit relocation of the connection in rresponse to the wiping action ofthe drum over the shoes.

10. In brake mechanism, a drum, a backing plate, a pair of articulated brake shoes pivotally. anchored to the backing plate Within the drum, a third shoe having a floating pivotal connection with one of said anchored shoes, said connection provided with positioning means on the opposite side of the backing plate.

l1. In brake mechanism, a drum, a backing'plate, a pair of articulated brake shoes pivotally anchored to the backing plate Withinthe drum, a third shoe having a floating pivotal connection with one of said anchored shoes, said connection provided withlapart extending through the backing plate and having positioning` means on the opposite side of said plate'.

12. In brake mechanism, a drum, a back- .ing plate, a pairof articulated brake shoes pivotally anchored to the backing plate within the drum, a third shoe having a floating pivotal connection with one of said anchored shoes, said connection having a art extending through the backing plate an held under spring tension to releasably position the connectlon.

1e. In'brake mechanism, a drum, a backing plate, a pair of articulatedbrake shoes pivotally anchored tothe backing plate Within the drum, a third shoe having a Heating piv-` otal connection with oneof said anchored shoes, said connectionhaving a part extend- Y plate provided with an opening about said connection of sufficient size topermt floating movement thereof within the opening, said the backing plate surrounding the opening therethrough, and a spring encircling the connection and exerting a tension thereon to hold said ilange in rictional. engagementl with the 'backing plate. movement thereof' within the opening, posi- 14. In brake mechanism, a drum,a backing through the backing plate, said backing A f connection provided with a liange engaging ing plate, a air 'of articulated brake shoes pivotal] anc ored to thebacking plate within the rum, a third shoe hav a oatin pivotal connection with one of said anchore i shoes, said connection rovided with positioning means Aholdin t e same in frictional engagem nt with the acki'npl'ate.

15. Inrake mechanism,a um,abacking plate, a pair of articulated brake shoes ivotall anchored to the backing late wit in the rum, a third shoe havin a oatinA pivotal connection with one o said anc cred shoes, said connection provided with positioning means exerting a spring tension 5. thereon holding 'the same in frictional engagement with the backing plate to positionl the same with respect. thereto. 16.v A brakecomprising a tarding means engageable with the drumyin D" combination with means for holding at least a portion of the retarding means in any position to which itl is shifted, thejeccentricities of the-'drum serving to shift said portion of jthe retarding meansto a position sli htly 5 spaced from the drumwhen'. the bra ef 1s released. 17. A brake comprising a ,drumf and retarding means engageable" with the drum, in combination with"means operated by the vec- `0 centricities of the drum to determine the position of the retardingmeans with respect to the drum when the brake is released.'

18. A brake comprising a drum. and retarding means engageable therewith, incom- 5 bination with yielding mechanism operable to releasably hold the retarding means at drum and rel.

any position to it may be moved by the `drum vwhen the vbrake is released.

19. A brake having a 'drum and retarding Apartvat least of the retarding means at that position to which it is moved by upon release ofthe brake.

21. Abrake having a drum and retarding A I means engageable therewith in combination the drum with a part exerting a constant tension on the retarding means tending to hold a portion thereof at that position to which it is moved by the drum upon release of the brake. 4 22. A- brake having a drum, a backin plate, and retarding means engageable witg the drum, in combination with a spring actuated part havin Africtional enga ement with the backing p ate and connecte with vthe retarding means to releasably automatisition to, which cally hold-the sameat that it is'moved by the eccentricities of the drum upon release of the brake. In testimony whereof, I, signg this specification.

' ROY ssANFonp.

Roar S. Samoan, 

